taking off two cats

Mach Stang · May 21st, 2011, 06:37 PM

well since I have no emission testing, i want to take off at least to cats for now.

questions about this...

witch would be best to remove? the 2 right after the manifold (yes i still have that) or the 2 before the mufflers?

are they welded in or clamped in?

more questions will be asked when these are answered.

6ER THEN I 8ER! · May 21st, 2011, 06:45 PM

cut them off with a sawzaw (since most shops will not touch them...even in a non emission county)

zip tie the loose tubing to the under carriage...then drive to a shop to have tubing welded in...you'll have a code thrown until you elliminate it with either mil eliminators or a tune..

hope that helps

MRKsD3 · May 21st, 2011, 06:51 PM

I had my lower cats removed when I had my duals done... Precats still on.

6ER THEN I 8ER! · May 21st, 2011, 06:53 PM

Originally Posted by MRKsD3

I had my lower cats removed when I had my duals done... Precats still on.

looks good...just doesn't have the bungs on it for the rear o2's...i know the OP isn't going to have emissions...but if he ever has an inspection for any reason down the road it would help to be able to pass a visual.

or....does the v6 have the rear o2's further up the tubing? i haven't taken cats off my v6, just my GT so i don't know o2 placements.

Mach Stang · May 21st, 2011, 06:54 PM

Originally Posted by 6ER THEN I 8ER

cut them off with a sawzaw (since most shops will not touch them...even in a non emission county)

zip tie the loose tubing to the under carriage...then drive to a shop to have tubing welded in...you'll have a code thrown until you elliminate it with either mil eliminators or a tune..

hope that helps

that will be god loud if I drive there with nothing past the manifold lol

but thanks brah

BlueScreaM · May 21st, 2011, 06:54 PM

Originally Posted by MRKsD3

I had my lower cats removed when I had my duals done... Precats still on.

^ ha! I knew there was no way your car could sound that sick with cats!!!!

6ER THEN I 8ER! · May 21st, 2011, 06:54 PM

Originally Posted by Mach Stang

that will be god loud if I drive there with nothing past the manifold lol

but thanks brah

won't be too loud believe me...you'll still have the reasonators on lol

run open LT headers to a shop then tell me if you're cut cats are loud

Mach Stang · May 21st, 2011, 06:55 PM

Originally Posted by MRKsD3

I had my lower cats removed when I had my duals done... Precats still on.

would there be any sound difference between the precats being removed or the main cats?

6ER THEN I 8ER! · May 21st, 2011, 06:56 PM

Originally Posted by Mach Stang

would there be any sound difference between the precats being removed or the main cats?

major difference in loudness..think of the precats as resonators basically...not gonna change much if you take them off instead of the main cats...

Mach Stang · May 21st, 2011, 06:58 PM

so what would you recommend? main cats?

6ER THEN I 8ER! · May 21st, 2011, 07:00 PM

Originally Posted by Mach Stang

so what would you recommend? main cats?

yep....if you can't remove all 4 that is

MRKsD3 · May 21st, 2011, 07:01 PM

IIRC, the o2s are right before the lower cats... They cut the cats off right after the o2 sensors... Then they just welded shut those o2 sensor holes on the h-pipe...

Mach Stang · May 21st, 2011, 07:02 PM

cool, then i may think about removing th main cats and leaving the pre cats.

MRKsD3 · May 21st, 2011, 07:08 PM

Originally Posted by BlueScreaM

^ ha! I knew there was no way your car could sound that sick with cats!!!!

Lol It was never a secret...

Originally Posted by Mach Stang

cool, then i may think about removing th main cats and leaving the pre cats.

That sir, is what my setup is. Stock headers, precats, NO lower cats, h-pipe, flow orig 40s, GT tailpipes...

Mach Stang · May 21st, 2011, 07:12 PM

id be the same just without the H. sweet beans. I'll look into this when i get out of school next week.

SON1C · May 21st, 2011, 09:18 PM

just get an o/r h and sell your cats, or really upgrade and go lt's +shorty h

04Stangv6 · May 21st, 2011, 10:08 PM

MRK can u post a vid of ur 2 cats deleted+H pipe plz

recore · May 22nd, 2011, 01:20 AM

Originally Posted by MRKsD3

Lol It was never a secret...

That sir, is what my setup is. Stock headers, precats, NO lower cats, h-pipe, flow orig 40s, GT tailpipes...

Do you pass the California sniffer test with this set up? I want to do the same thing, but I'm worried it'll blow dirty.

MRKsD3 · May 22nd, 2011, 01:32 AM

This the most recent one... It was recorded in the basement parking lot at my job...

http://i1216.photobucket.com/albums/...g/823be7db.mp4

This was a few days after I got my duals... Don't mind the talking...

http://i1216.photobucket.com/albums/...g/ca7eedd6.mp4

MRKsD3 · May 22nd, 2011, 01:34 AM

Originally Posted by recore

Do you pass the California sniffer test with this set up? I want to do the same thing, but I'm worried it'll blow dirty.

I'm not due for another smog check till next year... The muffler shop that did my exhaust "assures" that I should pass the smog check...

May 21st, 2011, 06:51 PM	#3
MRKsD3 Wing on, wing off... JULY 2011 ROTM Join Date: Apr 2009 Location: Compton, CA Posts: 4,234 iTrader: 0 reviews	I had my lower cats removed when I had my duals done... Precats still on. __________________ SIG BY WABASHACOBRA99

May 21st, 2011, 07:01 PM	#12
MRKsD3 Wing on, wing off... JULY 2011 ROTM Join Date: Apr 2009 Location: Compton, CA Posts: 4,234 iTrader: 0 reviews	IIRC, the o2s are right before the lower cats... They cut the cats off right after the o2 sensors... Then they just welded shut those o2 sensor holes on the h-pipe... __________________ SIG BY WABASHACOBRA99

May 21st, 2011, 09:18 PM	#16
SON1C Run ur car, not ur mouth. 2003 Sonic Blue 4.6L Join Date: Jul 2010 Location: Northern Virginia Posts: 4,057 Blog Entries: 1 iTrader: 3 reviews	just get an o/r h and sell your cats, or really upgrade and go lt's +shorty h __________________ 238rwhp/263rwtq Drew's Build Thread

May 22nd, 2011, 01:32 AM	#19
MRKsD3 Wing on, wing off... JULY 2011 ROTM Join Date: Apr 2009 Location: Compton, CA Posts: 4,234 iTrader: 0 reviews	This the most recent one... It was recorded in the basement parking lot at my job... http://i1216.photobucket.com/albums/...g/823be7db.mp4 This was a few days after I got my duals... Don't mind the talking... http://i1216.photobucket.com/albums/...g/ca7eedd6.mp4 __________________ SIG BY WABASHACOBRA99

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May 21st, 2011, 06:45 PM	#2
6ER THEN I 8ER! Banned Join Date: Apr 2007 Location: Portland, TN Posts: 17,515 iTrader: 3 reviews	cut them off with a sawzaw (since most shops will not touch them...even in a non emission county) zip tie the loose tubing to the under carriage...then drive to a shop to have tubing welded in...you'll have a code thrown until you elliminate it with either mil eliminators or a tune.. hope that helps

May 21st, 2011, 10:08 PM	#17
04Stangv6 Regular 2004 Mustang v6 14.8 Join Date: Apr 2011 Location: Florida Posts: 63 iTrader: 0 reviews	MRK can u post a vid of ur 2 cats deleted+H pipe plz

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